Direct fixation fastener



FIG. 1 is a top perspective view of the direct fixation fastener of the present design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a left elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

CLAIM The ornamental design for a direct fixation fastener, as shown and described. 